React Software Engineer

Reston, VADescriptionConcept Solutions, LLC (CS) is seeking a React Software Engineer to support a mission-critical application modernization program for a Department of War (DoW) customer.This role offers an opportunity to help modernize and sustain production applications while improving how users access and interact with essential systems. The program is focused on creating a unified platform that provides single sign-on, a consistent user experience, and a repeatable approach to integrating existing applications—all while maintaining operational continuity.The ideal candidate brings hands-on React development experience, strong front-end troubleshooting skills, and familiarity with structured software release processes.Front-End Development and Application SustainmentTroubleshoot and resolve front-end defects across two React applications, including a small public-facing single-page application supported by a Redis-backed service.Support ongoing maintenance and sustainment of production applications to ensure reliability and functionality.Support embedded-adapter integration that enables legacy application functionality to operate within the modernized platform shell.Collaborate with the development team to maintain application stability while supporting modernization efforts.Participate in two-week Agile sprints, including customer demonstrations at the conclusion of each sprint.RequirementsMinimum of 3 years of professional front-end software engineering experience using React.Experience working within formal software release processes.Preferred QualificationsExperience working with Java-based back-end systems.Familiarity with accessibility testing.Active Secret security clearance.Work Location and ScheduleLocation: Hybrid. Work may be performed at CS headquarters in Reston, Virginia, and approved remote locations within the United States. On-site support at government facilities in Northern Virginia and Maryland is required as needed.Schedule: Full-time, 40 hours per week, Monday through Friday, with core hours of 9:00 a.m.–3:00 p.m. Eastern.Development Cadence: Two-week sprints with customer demonstrations each sprint.Travel: 0–10%, within the Washington, DC metropolitan area.Security Requirement: U.S. citizenship required. Must be eligible to obtain and maintain a DoW security clearance. An active Secret clearance or higher is strongly preferred and may allow an earlier start.Compensation: $100,000–$120,000 base salary, depending on experience.Government-furnished equipment will be used for all access to government environments.This position is contingent upon contract award, with an anticipated start in October 2026.Company ProfileFounded in 1999 and headquartered in Reston, Virginia, Concept Solutions, LLC (CS) is a leading small business in technology, engineering, and management consulting. We are the innovative and agile force behind strategic solutions that enhance organizational efficiency and safeguard our nation across Aerospace, Defense, and National Security sectors.For over 25 years, CS has been a trusted partner for the Federal Aviation Administration (FAA), Department of Homeland Security (DHS), Department of Justice (DOJ), Department of Defense (DoD), and other federal agencies delivering vital IT, security, and project management services.Our commitment to excellence is reflected in our adherence to CMMI-DEV ML3, ISO 9001:2015, ISO/IEC 20000-1:2018, and ISO/IEC 27001-1:2013 standards.Company HighlightsAwarded over $300 million in FAA contracts, demonstrating our continued growth and trusted federal partnerships.Multiple contract vehicles supporting federal customers across FAA, DoD, NOAA, and other agencies.An Innovation Council and Internal Research and Development (IR&D) program that encourage innovation, emerging technologies, and employee-driven solutions.At CS, we know our success stems from our talented team. That's why we prioritize the wellbeing and growth of our employees, fostering a positive culture centered on innovation, engagement, and career development.BenefitsConcept Solutions offers a competitive benefits and salary package you would receive from a large company. We offer health, dental, vision and life insurance, as well as a comprehensive 401(k) plan with matching and immediate vesting.Equal OpportunityConcept Solutions is an Equal Opportunity Employer, and we value workplace diversity. We invite resumes from all interested parties and consider applicants for all positions without regard to race, color, religion, sex, national origin, age, marital status, sexual preference, personal appearance, family responsibility, the presence of a non-job-related medical condition or physical disability, matriculation, political affiliation, veteran status, or any other legally protected status. Concept Solutions is a VEVRAA federal contractor, and we request priority referral of veterans for available positions.